mcneil



91). c. .M. NE1L. 0F OSGYEOLAQH MISSOURI" Letters Putmtlil'o. 79,374,dated June 80, 1868.

- it: 5x11271111: mm In in time 32th:: fitted ant making part at 1m ToALL WHOM IT MAY CONCERN:

ZBe it known that I, D. C. MoNnzn, of Osceola, in the county of St.Clair, invented anew andimprovedlnk; and I dohereby. declare that thefollowing is a non thereof, which will enable those'skilled in the artto make and use the shin -I This invention relates to snow and improvedinl-r', whereby the ink, when used on paper, is invisible, no writing ormarks appearing until thepaper is exposed-to the fire, when the ink orwriting immediately appears and shows as black-ink writing} or, it firstput intowater, and not held to ithe fir the writing will appear. afterwhich the fire will have no efi'ect upon it,ibut the writing willdisappear when the paper is dried, and will again appear when wetted,-asat first, and as oftenas desired, by drying and wetting. i

And the invention consists in composing the ink so as to produce thiseffect, and in theuse of the following ingredients, viz:. i

Aes'dum rulpl uricum, 0P5 i. Aqua distillata, 5 iii;

Saccharum purum, Sss. This composition should be used with a quill-pen,and will be found invaluable in transmitting secrets, in I time of warespecially, as descriptions of forts, movements of troops, &c., may betransmitted without fear of discovery, as when the paper and ink are drythe paper appears perfectly blankl. I claim as new, and desire to secureby Letters Patent- An ink .com described The above specification of myinvention signed by me, this 12th day oi March, 1868.

. -D.., c. McNEIL. Witnesses:

and State of Missouri, have full, clear, and exact descrippo'sed ofthe'in'gredients and in about the proportions substantially ashereinnamed and En.- P. 'Bsn'rnsrr D. P. SHIELl

